AT89LP6440-20JU Atmel, AT89LP6440-20JU Datasheet - Page 11

• Manufacturer Part Number: AT89LP6440-20JU
• Description: MCU 8051 64K FLASH ISP 44PLCC
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP6440-20JU

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 38
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 8K x 8
• Ram Size: 4.25K x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 8 KB
• Interface Type: 2-Wire, SPI
• Maximum Clock Frequency: 24 MHz
• Number Of Programmable I/os: 38
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: AT89ISP
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• On-chip Dac: 10 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.2
3.2.1
3706A–MICRO–9/09
Internal Data Memory
DATA
Figure 3-1.
The AT89LP6440 contains 256 bytes of general SRAM data memory plus 128 bytes of I/O
memory mapped into a single 8-bit address space. Access to the internal data memory does not
require any configuration. The internal data memory has three address spaces: DATA, IDATA
and SFR; as shown in
internally. See
Figure 3-2.
The first 128 bytes of RAM are directly addressable by an 8-bit address (00H–7FH) included in
the instruction. The lowest 32 bytes of DATA memory are grouped into 4 banks of 8 registers
each. The RS0 and RS1 bits (PSW.3 and PSW.4) select which register bank is in use. Instruc-
tions using register addressing will only access the currently specified bank. The lower 128 bit
addresses are also mapped into DATA addresses 20H—2FH.
LOWER
UPPER
128
128
Program Memory Map
Internal Data Memory Map
“External Data Memory”
FFH
7FH
80H
0
Figure
AND INDIRECT
ADDRESSING
ADDRESSING
0100
0000
0000
BY INDIRECT
ACCESSIBLE
01FF
007F
ACCESSIBLE
FFFF
DATA/IDATA
BY DIRECT
IDATA
ONLY
3-2. Some portions of external data memory are also implemented
Atmel Signature Array
User Signature Array
Program Memory
AT89LP6440
below for more information.
ADDRESSING
ACCESSIBLE
AT89LP6440 - Preliminary
BY DIRECT
SFR
SPECIAL
FUNCTION
REGISTERS
FFH
80H
SIGEN=1
SIGEN=0
PORTS
STATUS AND
CONTROL BITS
TIMERS
REGISTERS
STACK POINTER
ACCUMULATOR
(ETC.)
11